A copper wire with a cross-sectional area of 2 mm² carries a current of 10 A, prompting a discussion on calculating the number of electrons passing through the wire per second. The relationship between current, charge, and time is clarified, with the formula stating that current (in Amperes) equals charge divided by time. To find the total charge, the current is multiplied by time, and then this charge is divided by the charge of a single electron, which is approximately 1.6 x 10^-19 coulombs. The area of the wire is deemed irrelevant for this specific calculation. The discussion effectively leads to the conclusion that understanding the definition of current is key to solving the problem.
